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On Thu, 30 Jun 2005, Ed Hartnett wrote: > As I understand it, using fixed-length data, my different processes > could write their data and go on their merry way, without waiting for > anything. This can be done only if you know that the different processors are not updating the same chunk. Fixed vs extended is not relevant to the basic issue: you must coordinate all writes in parallel. > > As currently implemented, H5Dextend is called when needed as you write > the data in netcdf. That is, if you are writing a record at a time, > H5Dextend is called for each record. This will be quite slow in parallel. But it will work. Presumably, user's can control this by batching the writes. -- Robert E. McGrath National Center for Supercomputing Applications University of Illinois, Urbana-Champaign Champaign, Illinois 61820 (217)-333-6549 mcgrath@xxxxxxxxxxxxx